CN110285018B - Wind driven generator and variable pitch device thereof - Google Patents
Wind driven generator and variable pitch device thereof Download PDFInfo
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- CN110285018B CN110285018B CN201910619966.6A CN201910619966A CN110285018B CN 110285018 B CN110285018 B CN 110285018B CN 201910619966 A CN201910619966 A CN 201910619966A CN 110285018 B CN110285018 B CN 110285018B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 210000000078 claw Anatomy 0.000 claims description 38
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 9
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009795 derivation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/40—Transmission of power
- F05B2260/402—Transmission of power through friction drives
- F05B2260/4022—Transmission of power through friction drives through endless chains
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05B2260/76—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism using auxiliary power sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/60—Control system actuates through
- F05B2270/602—Control system actuates through electrical actuators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The invention discloses a variable pitch device, which comprises a first chain wheel and a second chain wheel which are respectively meshed with a chain to realize chain transmission, wherein the first chain wheel is coaxially and rigidly connected with a flange plate for rotating and changing the pitch, and the second chain wheel is connected with a driving mechanism for driving the second chain wheel to rotate. The invention also discloses a wind driven generator. The variable pitch device applies the transmission mode of the chain wheel and the chain to the variable pitch device of the wind driven generator, and has the advantages of simple structure, reasonable size, uniform abrasion, stable variable pitch, long service life, easy maintenance and low maintenance cost.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a variable pitch device. Still relate to a wind-driven generator who adopts above-mentioned oar device that becomes.
Background
The variable pitch system has replaced the fixed pitch system to become the mainstream of the wind turbine, and the variable pitch system plays an important role in the operation of the wind turbine as an important execution structure for power control and safe operation of the wind turbine.
In a first prior art, two or more pitch drive mechanisms are used, and the pitch bearing is driven by an external gear. However, since the pitch angle is generally smaller, the worn gears are also more concentrated and the improvement in the life of the gears is smaller. In the second prior art, two or more sets of hydraulic driving devices are used to change the pitch angle, and although the power transmission through gears is not needed, the problems of the first prior art are avoided, the hydraulic cylinder is easy to leak oil due to the defects of the hydraulic cylinder, and the oil cylinder and the pipeline are difficult to arrange. In the third prior art, the structural strength and rigidity of the pitch system are improved, but the complexity of the internal structure of the hub is increased, the total weight of the hub is increased, more problems are caused to the wind turbine, and similar defects of hydraulic driving exist.
Therefore, how to provide a pitch control device which has the advantages of simple structure, reasonable size, stable transmission, uniform abrasion, prolonged service life and reduced maintenance cost is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a variable pitch device, which applies a transmission mode of a chain wheel chain to the variable pitch device of a wind driven generator, and has the advantages of simple structure, reasonable size, uniform abrasion, stable variable pitch, long service life, easy maintenance and low maintenance cost. Another object of the present invention is to provide a wind power generator.
In order to achieve the above object, the present invention provides a pitch control device, including a first sprocket and a second sprocket respectively engaged with a chain to realize chain transmission, wherein the first sprocket is coaxially and rigidly connected with a flange plate for rotating pitch control, and the second sprocket is connected with a driving mechanism for driving the second sprocket to rotate.
Preferably, the tensioning mechanism is symmetrically arranged on the outer side of the chain and used for adjusting the tightness of the chain.
Preferably, the driving mechanism includes a transmission shaft and a driving motor for driving the transmission shaft to rotate, and the second sprocket is coaxially and rigidly connected to the transmission shaft.
Preferably, the fixing device is used for controlling the second chain wheel to be stationary, and comprises a fixed ratchet wheel coaxially and rigidly connected with the transmission shaft and a stopping component used for contacting and stopping with the fixed ratchet wheel.
Preferably, the stopping assembly comprises a stopping pawl fixing shaft and a stopping pawl rotating around the stopping pawl fixing shaft, the stopping pawl is connected with a return spring for driving the stopping pawl to be in contact with the fixed ratchet wheel for stopping, and an electromagnet for electrifying and attracting the stopping pawl to be separated from the fixed ratchet wheel is arranged on one side of the stopping pawl.
Preferably, the number of the stopping claws is multiple, the stopping claws are located on the peripheral side of the fixed ratchet wheel, and the stopping claws are used for being installed and fixed on the hub of the fan.
Preferably, the fixed ratchet comprises a forward ratchet and a reverse ratchet with opposite tooth directions.
Preferably, the chain is in particular a silent toothed chain.
Preferably, the radial dimension of the second sprocket is smaller than the radial dimension of the first sprocket.
The invention provides a wind driven generator which comprises the variable pitch device.
Compared with the prior art, the variable pitch device provided by the invention comprises a chain, and a first chain wheel and a second chain wheel which are respectively meshed with the chain, wherein the first chain wheel is coaxially and rigidly connected with a flange plate, the second chain wheel is connected with a driving mechanism, the driving mechanism drives the second chain wheel to rotate in the variable pitch process of the variable pitch device, the second chain wheel and the first chain wheel realize chain transmission through the chain, the first chain wheel serving as a driven wheel rotates under the driving action of a driving wheel of the second chain wheel and the driving action of the chain, the flange plate rigidly connected with the first chain wheel coaxially rotates to change the pitch angle to realize the variable pitch of the variable pitch device, and the variable pitch device adopts a chain transmission mode to realize the change of the pitch angle so as to avoid a plurality of defects of hydraulic driving in the prior art; meanwhile, as the number of the meshing teeth of the chain transmission is large, the variable pitch device adopting the chain transmission has stable transmission and uniform abrasion, has longer service life, and reduces the maintenance cost and the design cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pitch device provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a forward ratchet according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a reverse ratchet according to an embodiment of the present invention;
fig. 5 is a schematic view of a force analysis of the fixed ratchet according to the embodiment of the present invention.
Wherein:
1-a tensioning mechanism, 2-a chain, 3-a first chain wheel, 4-a second chain wheel, 5-a transmission shaft, 6-a forward ratchet wheel, 7-a reverse ratchet wheel, 8-a driving motor, 9-a stopping claw, 10-an electromagnet, 11-a return spring, 12-a stopping claw fixing shaft and 13-a fan hub.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, in which fig. 1 is a schematic structural diagram of a pitch changing device according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention, fig. 3 is a schematic structural diagram of a forward ratchet according to an embodiment of the present invention, fig. 4 is a schematic structural diagram of a reverse ratchet according to an embodiment of the present invention, and fig. 5 is a schematic structural diagram of a force analysis of the forward ratchet according to an embodiment of the present invention.
In a first specific embodiment, the pitch control device provided by the invention comprises a chain 2, and a first chain wheel 3 and a second chain wheel 4 which are respectively meshed with the chain 2, wherein the first chain wheel 3 is also coaxially and rigidly connected with a flange plate which rotates to realize pitch control, and the second chain wheel 4 is also connected with a driving mechanism which outputs rotating power to drive the second chain wheel 4 to rotate.
Specifically, the first chain wheel 3 and the second chain wheel 4 which are both chain wheels are a rotating wheel with cog type chain buckling teeth, the rotating wheel is meshed with a block body with accurate pitch on the chain 2, the first chain wheel 3, the second chain wheel 4 and the chain 2 form a chain transmission chain wheel chain type variable pitch device, under the driving of driving force output by a driving mechanism, the second chain wheel 4 serves as a driving wheel to rotate, the first chain wheel 3 is driven by the chain transmission to rotate as a driven wheel, a flange plate rigidly connected with the first chain wheel 3 coaxially rotates, and the pitch angle is changed, so that the variable pitch effect of the chain transmission chain wheel chain type variable pitch device is realized.
In this embodiment, in order to ensure the stability and effectiveness of the pitch variation process, that is, the stability of the chain transmission, it is necessary to ensure that the chain 2 is in meshing transmission with the first chain wheel 3 and the second chain wheel 4 in a certain tense or slack state, so that the tensioning mechanism 1 is arranged outside the chain 2, and the tightness state of the chain 2 is adjusted by the tensioning mechanism 1, thereby further ensuring the stability of the chain transmission. Specifically, the tensioning mechanism 1 comprises a pair of tensioning wheels, and the two tensioning wheels are symmetrically pressed on the outer side of the chain 2 to ensure that the chain 2 is reliably meshed with the first chain wheel 3 and the second chain wheel 4 on the inner side.
In a specific embodiment, the driving mechanism comprises a transmission shaft 5 and a driving motor 8 for driving the transmission shaft 5 to rotate around the axis thereof, and the second chain wheel 4 is coaxially and rigidly connected with the transmission shaft 5. The driving mechanism in this embodiment outputs torque through the driving motor 8, the transmission shaft 5 serves as an output shaft of the driving motor 8 to output torque to drive the rigidly connected second chain wheel 4 to coaxially rotate, and the second chain wheel 4 serves as a driving wheel to further realize a pitch changing process.
It should be noted that the above-mentioned driving mechanism is only a specific arrangement, and the adoption of electric driving can avoid the defects of other driving methods in the prior art, but this is not a limitation that the driving mechanism cannot adopt other driving methods in the prior art, for example, hydraulic driving should also belong to the scope of the description of the present embodiment; meanwhile, the transmission shaft 5 directly drives the rigidly connected second chain wheel 4 to rotate coaxially, the structure is simple and compact, and a mode of transmission by staggering the rotation shafts of the transmission shaft 5 and the second chain wheel 4 can be adopted, which also belongs to the description range of the embodiment.
For better technical effect, the device also comprises a fixing device used for controlling the second chain wheel 4 to be stationary, wherein the fixing device comprises a fixed ratchet wheel coaxially and rigidly connected with the transmission shaft 5 and a stop component used for contacting and stopping the fixed ratchet wheel. In this embodiment, the transmission shaft 5 rotates and drives the second chain wheel 4 to rotate, the fixed ratchet rotates coaxially with the second chain wheel 4, if the stopping component contacts the fixed ratchet and controls the fixed ratchet to remain stationary, the transmission shaft 5 is stationary, the second chain wheel 4 is stationary, the first chain wheel 3 is stationary, the flange is stationary, and the pitch angle is not changed. Therefore, when the variable-pitch device stops changing the pitch or stops working, the whole variable-pitch device keeps in a static state by additionally arranging the fixing device, and the driving motor 8 and other components are protected.
Illustratively, the stopping assembly comprises a stopping claw fixing shaft 12 and a stopping claw 9 rotating around the stopping claw fixing shaft 12, an electromagnet 10 is arranged on one side of the stopping claw 9, and the stopping claw 9 is further connected with a return spring 11. In the embodiment, when the electromagnet 10 is powered on, the electromagnet 10 provides a magnetic attraction force to the tail of the locking claw 9, the locking claw 9 rotates around the locking claw fixing shaft 12 under the attraction of the magnetic attraction force and is separated from the fixed ratchet wheel, the claw head of the locking claw 9 is not in contact with the ratchet wheel teeth of the fixed ratchet wheel, and the transmission shaft 5 can rotate freely and is not restrained by the locking claw 9; when the electromagnet 10 is powered off, the electromagnet 10 no longer attracts the stop pawl 9, and the stop pawl 9 reversely rotates around the stop pawl fixing shaft 12 under the action of the elastic force of the return spring 11 and returns to a state of contacting and stopping with the fixed ratchet.
For better technical effect, the number of the stop pawls 9 is multiple, and the number of the stop pawls 9 can be changed according to actual conditions; the plurality of locking claws 9 are positioned on the periphery side of the fixed ratchet wheel, and the plurality of locking claws 9 are fixedly arranged on the fan hub 13. In the embodiment, each stopping claw 9 is provided with a corresponding electromagnet 10 and a return spring 11, all the electromagnets 10 are simultaneously electrified to control all the stopping claws 9 to be separated from the fixed ratchet wheel, so that the free rotation of the transmission shaft 5 under the driving motor 8 is realized, and conversely, when the electromagnets 10 are powered off, the transmission shaft 5 is in a stopping state.
In this embodiment, the mounting position of the holding pawl 9 is tangential to the profile of the fixed ratchet wheel, and the benefit of the tangential mounting position is analyzed at 60 ° for example:
T＝F2*r；
T＝F1*cos60°*r；
F2＝F1*cos60°。
F1and F2The direction of the force applied to the fixed ratchet by the holding pawl 9 in the different mounting positions in fig. 5 is shown, wherein F1Orthogonal decomposition is carried out according to a connecting line parallel to the action point and the center of a circle and a direction vertical to the connecting line, F2The direction of (A) is consistent with the tangential direction of the ratchet wheel, so that F can be known under the condition of the same moment1Concentrated stress at the point of action is large, and F2The concentrated stress of (2) is small. To reduce the maintenance cost of the device, the magnitude of the concentrated stress on the fixed ratchet wheel should be reduced as much as possible. Therefore, the locking pawl 9 is installed by adopting the scheme that the locking pawl 9 is tangent to the fixed ratchet wheel.
Besides, the fixed ratchet comprises a forward ratchet 6 and a reverse ratchet 7, the tooth shapes of the forward ratchet 6 and the reverse ratchet 7 are opposite, and the peripheral sides of the forward ratchet 6 and the reverse ratchet 7 are provided with stop pawls 9 corresponding to the tooth shapes. In the present embodiment, the ratchet teeth of the fixed ratchet have directionality and thus, in relation to both rotational directions of the drive shaft 5, the holding pawl 9 contacts the holding forward ratchet 6 to achieve a holding effect when the drive shaft 5 is rotated clockwise in the forward direction; when the transmission shaft 5 rotates anticlockwise reversely, the stop pawl 9 contacts the stop reverse ratchet 7 to achieve a stop effect.
For better technical effect, the chain 2 is a silent toothed chain, so that the transmission stability and effectiveness of the chain are ensured, and the pitch noise is effectively reduced.
In addition, the radial dimension of the second chain wheel 4 is smaller than that of the first chain wheel 3, except that the first chain wheel 3 arranged on the flange plate is larger (compared with other parts), the dimensions of other parts are smaller, the maintenance is very easy even if the first chain wheel is damaged, a large part of hoisting cost is saved, and the later maintenance cost is greatly reduced.
In the present embodiment, the design concept of the chain transmission sprocket chain type pitch device is given below.
Formula F ═ m ω according to the centrifugal force2r, calculating the derivation:
dpc＝ω2rdm；
dTc＝dF*AC；
wherein: r is the severity of the blade, ds is the area of the leaf element infinitesimal, dr is the radius of the leaf element infinitesimal. And deducing from the relation of the rotating coordinates to obtain:
then the following steps are carried out:
obtaining:
requirement TcFirst to dJxyIntegrating and then integrating dr; finally obtaining Tc. Assuming that the x 'y' axis is the main axis of inertia, so x 'y' ds is 0, so:
from material mechanics knowledge, the product of inertia of the graph over the main axis of inertia is zero, thus:
so as to obtain:
in the formula:
∫∫sx'2ds＝Jmax，∫∫sy'2ds＝Jmin。
the derivation yields:
therefore:
wherein J ismaxAnd JminCan be calculated by an approximate formula, and adopts an approximate algorithm:
wherein: b is the chord length of the blade, c is the thickness of the section of the blade, D is the revolution diameter of the blade, and gamma is the density of the material of the blade (the selected density is 1700 kg/m)3Glass fiber reinforced plastic) of 9.82m/s2The calculated speed n' of the wind wheel is 3n, and n is the rated rotating speed of the wind wheel.
Calculated angular speed of the wind wheel:
t can be calculated by the formulac. Because the pneumatic moment, the gravity center of the blade deviate from the variable pitch shaft of the blade to generate the gravity moment, the elastic moment and the friction moment can be ignored, and the efficiency of the variable pitch device is 0.98, the feathering moment required by the rotation of the blade around the blade shaft is as follows:
T1＝Tc/0.98。
calculating to obtain the power required by the rotating flange plate according to the settlement result of the feathering moment and the relation between the torque and the power:
P＝T1*ω/9550。
the angular speed of the pitching process is relatively slow and the type of drive motor 8 is selected according to the calculated power.
Further, the diameter d of the first sprocket 3 is designed according to the magnitude of the required torque and the following formula:
wherein: fmaxIs the corresponding force when the motor outputs the maximum torque, d is the diameter of the first chain wheel 3,
the safety factor is. The diameter of the first sprocket 3 obtained by design according to the above process does not need to be as large as the blade root, and the size can be effectively reduced on the basis of satisfying the required rotational moment.
According to the diameter d obtained by the formula, and the expression of the transmission speed v of the chain 2, the related data of chain transmission can be obtained, and theoretical support is provided for subsequent design:
wherein: z is a radical of1And n1The number of teeth and the rotational speed, z, of the second sprocket 4, respectively2And n2The number of teeth and the rotational speed of the first sprocket wheel 3, respectively, while n2P is the chain pitch.
The model of the chain 2 is preliminarily selected according to the power and the rotating speed, and when all parameters are determined, whether the design is reasonable can be further verified through a verification formula (such as fatigue strength verification and the like).
And designing the chain 2, the first chain wheel 3 and the second chain wheel 4 in the variable pitch device according to the design data obtained in the process.
In the pitch control process of the pitch control device, when the driving motor 8 receives an electric signal needing pitch control, the electromagnet 10 connected with the driving motor 8 in series can obtain an electric signal, at the moment, the electromagnet 10 is electrified to attract the tail part of the stopping claw 9, so that the head part of the stopping claw 9 is separated from the fixed ratchet wheel, and the fixed ratchet wheel is in a free rotation state. At the moment, the transmission shaft 5 can drive the second chain wheel 4 to rotate under the driving force of the driving motor 8 and output torque, the first chain wheel 3 realizes the input of the torque through the chain transmission of the chain 2, the first chain wheel 3 drives the flange plate to rotate, and the pitch angle is changed to realize the pitch variation.
When the pitch angle meets the requirement, the driving motor 8 stops working, the electromagnet 10 is powered off and does not attract the tail part of the stopping claw 9 any more, and the stopping claw 9 rapidly enables the head part of the stopping claw 9 to be contacted and abutted with the fixed ratchet wheel under the action of the return spring 11 to achieve the stopping effect, so that the pitch angle is ensured to be unchanged.
When the machine needs to be stopped, firstly, the driving motor 8 and the electromagnet 10 are electrified, the stop pawl 9 is not contacted with the stop fixed ratchet wheel any more, and the pitch angle is changed into 90 degrees to realize feathering; secondly, the driving motor 8 and the electromagnet 10 are powered off, and the stop pawl 9 contacts the stop fixed ratchet again, so that the pitch angle is kept unchanged at 90 degrees. The wind driven generator in the feathering state receives the smallest lifting force when being shut down, and the shutdown safety of the fan is protected to the greatest extent.
The invention also provides a wind driven generator adopting the variable pitch device, in particular to a horizontal shaft wind driven generator, which has all the beneficial effects of the variable pitch device and is not repeated herein.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The wind driven generator and the variable pitch device thereof provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (5)
1. A variable pitch device is characterized by comprising a first chain wheel (3) and a second chain wheel (4) which are respectively meshed with a chain (2) to realize chain transmission, wherein the first chain wheel (3) is coaxially and rigidly connected with a flange plate for rotating and changing the pitch, and the second chain wheel (4) is connected with a driving mechanism for driving the second chain wheel (4) to rotate;
the driving mechanism comprises a transmission shaft (5) and a driving motor (8) for driving the transmission shaft (5) to rotate, and the second chain wheel (4) is coaxially and rigidly connected with the transmission shaft (5);
the fixing device is used for controlling the second chain wheel (4) to be static and comprises a fixed ratchet wheel coaxially and rigidly connected with the transmission shaft (5) and a stopping component used for contacting and stopping with the fixed ratchet wheel;
the locking assembly comprises a locking claw fixing shaft (12) and a locking claw (9) rotating around the locking claw fixing shaft (12), the locking claw (9) is connected with a return spring (11) used for driving the locking claw (9) to be in contact with the fixed ratchet wheel for locking, an electromagnet (10) is arranged on one side of the locking claw (9), the locking claw (9) is magnetically attracted by the electromagnet (10) when the electromagnet (10) is powered on so as to enable the locking claw (9) to be separated from the fixed ratchet wheel, and the locking claw (9) is elastically attracted by the return spring (11) when the electromagnet (10) is powered off so as to enable the locking claw (9) to lock the fixed ratchet wheel;
the number of the stopping claws (9) is multiple, the stopping claws (9) are positioned on the peripheral side of the fixed ratchet wheel, and the stopping claws (9) are used for being installed and fixed on a fan hub (13);
the fixed ratchet wheel comprises a forward ratchet wheel (6) and a reverse ratchet wheel (7) which are opposite in tooth shape direction.
2. The pitch device according to claim 1, further comprising a tensioning mechanism (1) symmetrically arranged on the outer side of the chain (2) for adjusting the tightness of the chain (2).
3. A pitch device according to claim 1 or 2, wherein the chain (2) is in particular a silent toothed chain.
4. A pitch device according to claim 3, wherein the radial dimension of the second sprocket wheel (4) is smaller than the radial dimension of the first sprocket wheel (3).
5. A wind power generator, characterized by comprising a pitch device according to any of claims 1-4.
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|---|---|---|---|
| CN201910619966.6A CN110285018B (en) | 2019-07-10 | 2019-07-10 | Wind driven generator and variable pitch device thereof |
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| CN201910619966.6A CN110285018B (en) | 2019-07-10 | 2019-07-10 | Wind driven generator and variable pitch device thereof |
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| CN110285018A CN110285018A (en) | 2019-09-27 |
| CN110285018B true CN110285018B (en) | 2021-01-26 |
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| CN201344094Y (en) * | 2008-12-18 | 2009-11-11 | 上海电气液压气动有限公司 | Mechanism for controlling steering, blade pitching and braking of wind power equipment |
| FR2946010B1 (en) * | 2009-05-29 | 2011-06-24 | Snecma | FIXED CYLINDER DEVICE FOR CONTROLLING BLOWER BLADES OF A TURBOPROPULSER |
| CN101955138A (en) * | 2009-07-17 | 2011-01-26 | 卫华集团有限公司 | Safety brake of electric block |
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| CN207048898U (en) * | 2017-08-24 | 2018-02-27 | 青岛瑞恩吉能源科技有限公司 | A kind of wind-driven generator pitching drive mechanism |
| CN207195503U (en) * | 2017-12-27 | 2018-04-06 | 大庆市天德忠石油科技有限公司 | Brake gear assembly on beam pumping unit |
| CN208416786U (en) * | 2018-04-26 | 2019-01-22 | 新乡市恒德机电有限公司 | The wind turbines rotor of automatic variable pitch and disability protection |
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2019
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| EP1043202A1 (en) * | 1998-11-04 | 2000-10-11 | Nhk Spring Co.Ltd. | Pretensioner for seat belts |
| CN109990067A (en) * | 2019-04-12 | 2019-07-09 | 燕山大学 | A kind of outer shock wave swing rod movable teeth reducer of check |
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